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You can customize the diagram using the
Filters button 
from the toolbar.
Use the drop-down menu at the top of the dialog to select from available filters.
Use the buttons in the top-right corner of the dialog to create, duplicate, or delete the current filter.
Use the checkboxes at the bottom of the dialog to further clean up the diagram.
A filter is defined using filter rules (one per line). The general form of a filter rule is:
command element_kinds matching regex [ using color_name_or_code]
command is one of hide, show, or color
element_kinds is a comma-separated list of kinds. The available kinds are instances, types, ports, port types and transaction types
regex is a regular expression that matches the relevant diagram element labels
color_name_or_code is a color specified by name, 6- or 3-digit hexadecimal code, comma-separated decimal RGB code or the keyword random. This is relevant only for color rules.
To apply a filter rule only to elements under a specific instance, you must provide the relevant path in the regex section of the rule:
a path must always begin with the name of the top instance in the diagram (if instance is under top_instance, then top_instance/instance/... is valid, while instance/... is not)
a path consists only of names of instances and " /"
each level is separated from the previous using " /'''" (valid: '''top_instance/inst1/inst2/...; not valid: top_instance.inst1.inst2...)
regular expressions may be used in the path section of a rule (for example, top_instance/.*/some_instance)
if the regex contains " /' ", everything before the last "/" is the ''path, the rest is used to match the relevant diagram elements (in the following example, the bolded text is the path: '''top_instance/.*/inst1/ .*drv.*)
if the regex does not contain " /", it applies to all elements of the appropriate element_kinds
TIP: You can hide the hierarchy under an instance with the filter "hide instances matching path/to/instance/.*".